The Alden children head to their aunt's ranch for the summer and make an amazing discovery! Adapted from Gertrude Chandler Warner's story of the same name, this early reader allows children to start reading with a Boxcar Children classic.

The Alden children are helping their new neighbors build a tree house when they discover an attic window that not even their neighbors knew about.

The orphaned Alden family children, now living with their grandfather on his island, are intrigued by the mystery of the nearby empty yellow house. Not satisfied to leave its 40 year old story unfinished, they uncover a trail of clues that leads them to the woods of Maine.

When the Aldens have the chance to work at a candy factory, they try to find out who is sabotaging the candy and why.